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Hydrogen storage composite material MgH2-Ni-rGO and method for preparing same

A composite material, mgh2-ni-rgo technology, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve the problems of high dehydrogenation temperature and slow dehydrogenation kinetics, and achieve low equipment requirements and moderate cost , easy-to-achieve effects

Inactive Publication Date: 2017-02-15
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since commercial MgH 2 Disadvantages such as high dehydrogenation temperature (>400°C) and slow dehydrogenation kinetics greatly limit its use, so by adding MgH 2 Combining with carbon materials [2], reducing MgH by chemical synthesis 2 Particle size [3] and other methods have become the current research hotspots

Method used

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  • Hydrogen storage composite material MgH2-Ni-rGO and method for preparing same
  • Hydrogen storage composite material MgH2-Ni-rGO and method for preparing same
  • Hydrogen storage composite material MgH2-Ni-rGO and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of graphene oxide GO

[0029] Weigh 2 g of natural graphite and pour it into a three-necked flask, add 100 mL of 65% HNO 3 , then slowly add 100 mL of 98% H at 0°C in an ice-water bath 2 SO 4 , after stirring for 1 h, add 10 g KMnO 4 , heated to 35 °C for 2 h, and then heated to 75 °C for 1 h; after cooling to room temperature, 500 mL of distilled water was added to dilute the concentrated acid to obtain a brown colloidal substance, and then 40 mL of 35% H 2 o 2 and 100 mL of 10% HCl to obtain a brownish-yellow solution; centrifuge and wash until neutral; dry in air at 50-60 °C to obtain graphene oxide;

[0030] (2) Ni(OH) 2 -GO preparation

[0031] 0.09 g C 4 h 5 o 6 Ni·4H 20, 0.07 g of cetyltrimethylammonium bromide and 0.1 g of hexamethylenetetramine were dissolved in 40 mL of deionized water, and another 160 mg of GO was weighed in 40 mL of deionized water for 2 h, and then the two After mixing and stirring for 10 minutes, place them in a ...

Embodiment 2

[0037] (1) Preparation of graphene oxide GO

[0038] Weigh 2.5 g of natural graphite and pour it into a three-neck flask, add 150 mL of 65% HNO 3 , then slowly add 150 mL of 98% H in an ice-water bath at 0°C 2 SO 4 , after stirring for 1 h, add 15 g KMnO 4 , heated to 35 °C for 2 h, then raised to 75 °C for 1 h; cooled to room temperature, added 500 mL of distilled water to dilute the concentrated acid to obtain a brown colloidal substance, then added 50 mL of 35% H 2 o 2 and 150 mL of 10% HCl to obtain a brownish-yellow solution; centrifuge and wash until neutral; dry in air at 50-60 °C to obtain graphene oxide;

[0039] (2) Ni(OH) 2 -GO preparation

[0040] 0.1 g C 4 h 5 o 6 Ni·4H 2 0. Dissolve 0.08 g of cetyltrimethylammonium bromide and 0.14 g of hexamethylenetetramine in 40 mL of deionized water, and weigh 180 mg of GO in 40 mL of deionized water for 2 h. After mixing and stirring for 10 min, put it in a polytetrafluoroethylene reactor, react at 120 ° C for 4 h...

Embodiment 3

[0046] First three steps are identical with the first three steps of embodiment 1;

[0047] MgH 2 - Preparation of Ni-rGO

[0048] Take 30 mg Ni-rGO, 45 mL cyclohexane, and 1.8 mL dibutylmagnesium in an autoclave, add 4 MPa H 2 , sonicated for 40 min, stirred for 2 h, reacted in an oil bath at 200 °C for 24 h, after the reaction, vacuumed at 80 °C for 12 h to remove the solvent to obtain MgH 2 -Ni-rGO.

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Abstract

The invention belongs to the technical field of hydrogen storage materials, and particularly discloses a hydrogen storage composite material MgH2-Ni-rGO and a method for preparing the same. The hydrogen storage composite material and the method have the advantages that the problem that MgH2 is used as a hydrogen storage material and is high in hydrogen storage capacity (7.6 wt.%H2) but application of the MgH2 is constrained due to the high hydrogen release temperature (higher than 380 DEG C) of the MgH2 can be solved by the aid of the hydrogen storage composite material and the method; Ni nano-particles and MgH2 nano-particles are loaded on graphene by the aid of solvothermal processes, the hydrogen release performance of MgH2 is improved under catalytic effects and nano-crystallization effects jointly, accordingly, 4.6 wt.% of high-purity hydrogen can be released by the prepared composite material MgH2-Ni-rGO at the temperature of 300 DEG C within 30 min, and the hydrogen storage composite material prepared by the aid of the method is a perfect hydrogen storage composite material.

Description

technical field [0001] The invention belongs to the technical field of hydrogen storage materials, specifically a new hydrogen storage composite material MgH 2 -Ni-rGO and its preparation method. Background technique [0002] With the rapid development of the national economy and the deepening of urbanization, the energy problem has become increasingly prominent, and the fossil energy currently used is not only seriously polluting, but also a non-renewable resource. Therefore, human beings urgently need to find a sustainable and non-polluting of clean energy. Hydrogen is a non-polluting (its combustion product is water), has a high combustion value (1.4×10 8 J / Kg) of renewable clean energy is the most ideal carrier of energy. However, due to the low density and low condensation temperature of hydrogen, it is very difficult to use traditional storage methods such as high-pressure gas tanks and low-temperature liquid tanks. Therefore, finding safe and convenient solid-stat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/00
CPCC01B3/0078C01P2002/72C01P2004/04Y02E60/32
Inventor 余学斌梁明夏广林
Owner FUDAN UNIV
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